the rendering of the discs is not tip top, especially according to the scale we display them (in full, it still passes): streaks can appear.
I kind of missed my flat...
as for the powermate, I still can't make correct pictures of the surface (among other things, because of the newton rings that don't want to disappear with the flat... but I still have a second tilt ring to put on and adjust! )
Note that for the anim, the first 20 images were made at gain 100 and 55fps, while the next 20 are at gain 200 and 120fps! (for 900 images per film on arrival).
With the same treatment for the 41 (autostackert3 with 33% retained images), I did not notice significant differences at the end...